当一块 PCB 板中有多个数/模功能块时，常规做法是要将数/模地分开，这是为什么？

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当一块 PCB 板中有多个数/模功能块时，常规做法是要将数/模地分开，这是为什么？
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dxb0571

FYI:
1. https://www.teledyne-e2v.com/content/uploads/2014/09/Board-Layout.pdf
2.https://www.ti.com/lit/an/scaa082a/scaa082a.pdf?ts=1611023436950&ref_url=https%253A%252F%252Fwww.google.com%252F
3. Grounding in mixed-signal systems  demystified https://www.ti.com/lit/an/slyt499/slyt499.pdf
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GPX

减少串扰